Geometric Constructions: Perpendicular Bisector Techniques

Mr. Allen demonstrates how to construct a perpendicular bisector of segment AB using a compass and straight edge. He explains the process step-by-step, including setting up the compass, drawing intersecting arcs, and connecting points to form the bisector. The video also explores the properties of the bisector, such as equidistant points from the segment's endpoints. The tutorial emphasizes the importance of mastering perpendicular bisectors for geometric constructions.

What tools are required to construct a perpendicular bisector?

• Pencil and eraser

• Calculator and graph paper

• Compass and straight edge

• Protractor and ruler

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Why is it important to open the compass to more than halfway of the segment?

• To draw a perfect circle

• To avoid breaking the compass

• To make the arcs larger

• To ensure the arcs intersect

What should you do if the arcs do not intersect?

• Ignore the intersection

• Use a different compass

• Draw one of the arcs a little longer

• Start over from the beginning

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What are the new points created by the intersection of the arcs called?

• Points M and N

• Points E and F

• Points C and D

• Points X and Y

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How can you verify that the line CD bisects segment AB?

• By drawing another line parallel to AB

• By checking if the distances from A to E and B to E are equal

• By measuring the angles

• By using a ruler to measure the lengths

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What is the significance of point E in the construction?

• It is the intersection of the arcs

• It is the center of the circle

• It is the endpoint of the bisector

• It is the midpoint of segment AB

What property does any point on the perpendicular bisector have?

• It is closer to point B

• It is closer to point A

• It is farther from point A

• It is equidistant from points A and B

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What happens if you pick a point above points C and D on the perpendicular bisector?

• It will not be equidistant from A and B

• It will be closer to point B

• It will be closer to point A

• It will be equidistant from A and B

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What are the three main outcomes of constructing a perpendicular bisector?

• Finding the midpoint, creating a right angle, and bisecting the segment

• Finding the midpoint, creating a right angle, and dividing the segment into three parts

• Finding the midpoint, bisecting the segment, and drawing parallel lines

• Creating a right angle, bisecting the segment, and drawing a circle

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What is the main focus of the video?

• Measuring angles

• Constructing parallel lines

• Drawing circles

• Constructing a perpendicular bisector

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CCSS.HSG.CO.C.9